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Allison Transmission Problems, any Ideas? Brent 2-10-03  
I have a 88 GMC RTS Model T802, the bus has been parked for a few months but recently the "DO Not Shift" light started blinking on the shifter when I started the bus, about the same time I noticed that My Voltage regulator Crapped out, I am wondering if there is a way to reset the computer or not? I was told there is not and that I need to find the problem (if there is one) or replace the computer, I have ordered a new Voltage regulator this week in hope that this is what is causing the Transmission problems but it seems unlikly to me? Any Ideas or anyone else run into this problem? Thanks in advance for any help.
Re: Allison Transmission Problems, any Ideas? Mark O. 2-15-03  
If you have a ATEC/DDED controls, they will not operate properly if you do not have the proper voltage.

On a 24-volt system, without at least 24-volts, the system will go into reset mode. If you turn the power off and repower with at least 24-volts your system should automatically reset itself.

If it doesn't, you have more problems. About the only way to find out what is going on for sure is to hook up to your local Allison dealer's computer.

Good luck.

Mark O.
Re: Allison Transmission Problems, any Ideas? Edwin 8-6-03  
Incorrect supply of voltage to the ECU activated the auto-protection of your transmission.
If no shortage or problem in the wirings,replacing your voltage reg. should solve your problem.
Re: Allison Transmission Problems, any Ideas? F Johnson 10-23-09  
Hi I have aproplem wiyh mmyTransmisson. Turn the key on will not start untill you hear a clickin noiseand it stops. Runs fine for about i hour then the lights on the shift pad stant to blink then check tran light comes on. Then it seems to want to down shift to limp mode. If I stop and waint 30 min. it start up fine for a nother hour or so then the same proplem again Fay
Re: Allison Transmission Problems, any Ideas? Burel Block 5-4-03  
I have a 2001 Chev Duramax 3500. It operated super for 2 years. Now the service engine light comes on and the transmission starts slipping and heating up. What's wrong???
Re: Allison Transmission Problems, any Ideas? jim priour 9-15-03  
I have an allison at545n in a c70 95 chevy. It works fine in forward but will not go into reverse unless you rev it o over 4000 rpms...can you help me???? jim
Re: Allison Transmission Problems, any Ideas? johnny 1-15-08  
Motor starts, but trans won't engage. ECM doesnt light up at all. Don't want to buy new Computer for it if it's something repairable. 1993 Winnebago Vectra Turbo Diesel.
Re: Allison Transmission Problems, any Ideas? larry schram 9-22-07  
I'm helping a friend get an old gm buss going.the vh9 allison trans grinds when you try to put it in gear and there's a soliniod on top of the trans that has somthing to do with reverse.any ideas would be great.
Re: Allison Transmission Problems, any Ideas? j martin 1-21-08  
I have 97 M/H pushed by a cat with a 3060 Allison and it leaks trans oil when it is parked not running, most of the time when I get ready to make a trip I have to put 2 qt. of oil in befor it moves. The leak is on the side of the valve body, it looks like some kind of persure dump, the oil just leaks out slow, after a while it stops. Anyone know anything about this,
I do all the maint. on my rig but this has got me stumped.
Re: Allison Transmission Problems, any Ideas? Randy 2-8-09  
I hope you have figured out your problem by know.This trans has a dual dipstick provision,the plug for the unused provision is leaking.Allison offers an updated plug which will solve your problem.
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